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GENERAL44216
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Last modified
8/24/2016 8:13:01 PM
Creation date
11/23/2007 12:54:47 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981044
IBM Index Class Name
General Documents
Doc Date
12/11/2001
Doc Name
Page 33 through OSM Mine Plan Approval
Permit Index Doc Type
Other Permits
Media Type
D
Archive
No
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The ground water quality of the Trout Creek sandstone, lying below the mining <br />• levels, is not likely to be impacted by water from the flooded Eagle No, 5 and <br />No. 6 workings. This aquifer is separated from the lowest seam to be mined by <br />approximately 250 feet of strata. This sedimentary section presently acts an <br />aquiclude between the mine workings and the Trout Creek aquifer, This, in <br />addition, assists in producing artesian conditions in the Trout Creek and a <br />tendency for upward water flow such as is now occurring from the sandstone to <br />the No, 5 Mine via connecting faults. The potential for deep percolation of <br />mine water into the Trout Creek aquifer, therefore, seems limited. Since the <br />Trout Creek sandstone will also have no mine facilities located over its <br />outcrop or subcrop, there should not be any contamination of this aquifer by <br />the mine operations. <br />The flooding of the Eagle No. 5 and No. 6 Mine should not impact the quality <br />of water in the Twentymile or White sandstones, given the stratigraphic <br />separation of these aquifers from the level of the mine workings. Ground <br />water quality in the Middle sandstone, however, has some probability of being <br />contaminated by water from the flooded No. 5 and No. 6 Mines. There is <br />approximately 125 feet of section separating the Middle sandstone from the "F" <br />seam in which the No. 5 Mine is located. There is, however, a probable fault <br />connection between the mining level and the Middle sandstone. These fault <br />connections could be the means, as hydrostatic head differences are reversed <br />between the flooded mine levels and the Middle sandstone of moving degraded <br />water from the mine into the aquifer. The Middle Sandstone, however, is not <br />utilized as a source of water for beneficial use in the area. As a result, <br />there will be little practical impact of this contamination on the quality of <br />• local ground water supplies. <br />Some water from the flooded mine workings may enter the surface water/alluvial <br />systems by means of discharge thru springs or seeps at outcrops or subcrops of <br />the coals being mined. Given the primary permeability of these coals and <br />their associated roof and floor strata, the quantities of degraded mine water <br />discharge may not be large but, depending upon the static head developed in <br />the flooded mine, the degree of degradation of the water, and the extent of <br />the discharge area, the impacts on water quality in the Williams Fork River <br />and alluvium could be significant. <br />The operator acknowledges that the No. 5 and No. 6 Mines may flood to levels <br />above the No. 5 Mine portal and result in some discharge of mine water into <br />the Williams Fork River and/or alluvium by means of subcrops of the "E" and <br />"F" coal seams in the Williams Fork Valley. The quality of the mine water at <br />this time is uncertain. It will be at least as saline as the present mine <br />discharge, it may be more degraded. <br />The operator has estimated the magnitude of this discharge at a time when the <br />static head in the mine might be 100 feet above the level of the "E" and "F" <br />coal subcrops. Based on this volume of water and the present quality of water <br />being discharged from the No. 5 Mine, the operator pre id ci:s a possible <br />downstream increase in SAR in the Williams Fork alluvial water from 1.9 to <br />5.2. Since the salinity of the water currently being discharged from the No. <br />5 Mine is less than that in the Williams Fork alluvium, there could be an <br />• <br />-36- <br />
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